I run with a Pally tank who is usually our OT. When trying to heal his damage is very spikey and he seems to take a lot more damage then our Bear or Warrior tanks. Is there anything you can see in logs that can help me provide some constructive advice to him.

I'm not good at logs so I'll leave that to others. But if your guy is Zeifer, from Eonar US... He could do with wearing a second mastery trinket since he falls short of block cap by about 6.5%. He favours mastery, which is good, but he's got a weird +40 dodge rating gem in the yellow socket in his helm. I can't help but think he put the wrong gem in since his other pure yellows are all full mastery gems. He's missing a JC gem though... but really that's piddly stuff compared to getting block capped. The Tol Barad trinket (which any good tank should have) would smooth out his damage a lot alongside the spidersilk spindle.